Document Detail

Comparison of vasoactive response of left and right internal thoracic arteries to isosorbide-dinitrate and nitroglycerin: an in vitro study.
MedLine Citation:
PMID:  12869171     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: The internal thoracic artery (ITA) is the most important graft in coronary artery bypass grafting. Its distal region is, however, prone to vasospasm. We studied the effects of nitroglycerin (NTG) and isosorbide-dinitrate (DSDN) on distal segments of left versus right ITA. METHODS: Rings of distal segments (6 to 9 mm proximal to bifurcation) of the human left and right ITA were studied. After baseline contraction of the rings, achieved using 60 mmol/L of KCl, they were exposed to increasing doses of ISDN and NTG (10 to 100 microg/ml), and dose-response curves were recorded. RESULTS: The contractile response of left ITA rings to KCl were significantly lower than those of right ITA rings (1.87 +/- 0.25 g versus 3.5 +/- 0.61 g, p < 0.005). Both nitrates inhibited the contractile response in a concentration-dependent manner, with relaxing effects of ISDN higher than those of NTG (p < 0.01) in both left and right ITA rings. CONCLUSIONS: The distal segment of the left ITA is less prone to vasospasm than that of the right. ISDN has a considerably higher relaxant effect on this segment than NTG. We therefore recommend favoring high doses of ISDN over NTG as an antispastic measure.
Y Paz; I Frolkis; A Kramer; D Pevni; I Shapira; O Lev-Ran; R Mohr
Publication Detail:
Type:  Comparative Study; In Vitro; Journal Article    
Journal Detail:
Title:  Journal of cardiac surgery     Volume:  18     ISSN:  0886-0440     ISO Abbreviation:  J Card Surg     Publication Date:    2003 Jul-Aug
Date Detail:
Created Date:  2003-07-18     Completed Date:  2003-12-04     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8908809     Medline TA:  J Card Surg     Country:  United States    
Other Details:
Languages:  eng     Pagination:  279-85     Citation Subset:  IM    
Department of Thoracic and Cardiovascular Surgery, The Tel Aviv Sourasky Medical Center, Tel Aviv University, Israel.
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MeSH Terms
Coronary Artery Bypass / methods
Dose-Response Relationship, Drug
Isosorbide Dinitrate / administration & dosage,  pharmacology*
Mammary Arteries / drug effects*,  physiology
Nitroglycerin / administration & dosage,  pharmacology*
Vasodilation / drug effects*
Vasodilator Agents / administration & dosage,  pharmacology*
Reg. No./Substance:
0/Vasodilator Agents; 55-63-0/Nitroglycerin; 87-33-2/Isosorbide Dinitrate

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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